The ethanolic extract of the leaves of Clerodendrum formicarum, a Lameacious plant of Cameroon, afforded a new abeo-abietane diterpenoid named formidiol (1) together with some known diand triterpenoids. They include 12,16-epoxy-11,14-dihydroxy-6-methoxy-17(15→16)-abeo-abieta- 5,8,11,13,15-pentanene-3,7-dione (2), trans-phytol, friedelin and friedlan-3β -ol. Structures of all the isolated constituents have been characterized with the aid of 1D NMR spectroscopy while the structure of a new metabolite was elucidated via 2D NMR spectroscopic techniques.
Graphical Abstract
Terpenoids from Clerodendrum formicarum Gürke (Lamiaceae) of Cameroon
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